ICANT writes:
So why can't it be refered to as what it is? The Theory of Biological Evolution.
End of problem.
It can be called that, and that is strictly accurate, but usually unneccessary. If you you are on a forum that regularly discusses biological evolution more than any other kind of evolution, and if you are in a section of that forum with the title "EvC Forum/All Forums/Science Forums/
Biological Forums", then, using just a little bit of intelligence, you would realise that no-one needs to type "biological" when referring to the Biological Theory of Evolution, because it's already understood in the context.
Even off this site, as the theory of biological evolution is the best known theory of evolution, it is usually referred to with the word biological omitted and understood, and adjectives are included to describe other lesser known theories of evolution.
That's a fact of modern English, which is what we speak on this site, ICANT, in case you hadn't noticed.